KT-500D滑阀式机械泵磨损原因分析及修复

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Cause Analysis and Repair of Abrasion for KT--500DSlide-valve Mechanical PumpZHU Yi，ZHANG Zhi-yuan(Inner Mongolia Rare Earth Ovonic Metal Hydride Co.Ltd.，Baotou 014010，Nei Monggol，China)Abstract：KT-500D slide-valve mechanical pump is the necessary fore vacuum pump for the vacuum system of vac-·nun melting fumace in Hydride Company.In the paper，the causes of abrasion for transmission shaft，eccentric wheel，slidevalve，guideway of slide valve and pump body of mechanical pump caused by dust and water in smelting as wel as the lubri-cation is not good are analyzed combining with the working principles of pump.The worn surface is repaired with the surfacerepair technology of cold welding and the pump could meet operating requirements。

Key words：slide-valve mechanical pump；transmission shaft；eccentric wheel；slide valve；guideway of slide valve；repairKT-500D型滑阀式机械泵是包钢稀土贮氢公司贮氢合金、高温合金真空熔炼过程中抽取熔炼室、模室等密闭腔室内气体以获得所需真空的关键设备，它是-种容积泵，与罗茨泵配合使用可获得低于13.3 Pa的理想真空冶炼条件。因此，机械泵工作的好坏直接影响合金的真空冶炼过程，进而影响产品品质。

1 工作原理及使用条件KT-500D型机械泵主要由滑阀导轨、泵体、偏心轮 、传动轴、滑阀(由滑阀环和滑阀杆组成)、排气阀等零部件组成如图 1所示，它是利用偏心轮带动滑阀，使滑阀与泵腔产生-个由油膜所密封的的密闭腔，通过进气口、排气 口时，密闭腔的体积由大变小，从而使腔室内的气体受到压缩而被排出泵腔之外的-种容积泵 。当气体通过泵体并被压缩时，密封油和排出的气体混合